1239972646 has 8 divisors (see below), whose sum is σ = 2029046184. Its totient is φ = 563623920.

The previous prime is 1239972637. The next prime is 1239972647. The reversal of 1239972646 is 6462799321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1239972646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239972647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28181175 + ... + 28181218.

It is an arithmetic number, because the mean of its divisors is an integer number (253630773).

Almost surely, 2^1239972646 is an apocalyptic number.

1239972646 is a deficient number, since it is larger than the sum of its proper divisors (789073538).

1239972646 is a wasteful number, since it uses less digits than its factorization.

1239972646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56362406.

The product of its digits is 979776, while the sum is 49.

The square root of 1239972646 is about 35213.2453204756. The cubic root of 1239972646 is about 1074.3291710878.

The spelling of 1239972646 in words is "one billion, two hundred thirty-nine million, nine hundred seventy-two thousand, six hundred forty-six".